Unobserved covariates in the two-sample
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Philippe BroΓ«t; Thierry Moreau; Joseph Lellouch; Bernard Asselain
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Article
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1999
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John Wiley and Sons
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English
β 87 KB
π 2 views
In analysing a clinical trial with the logrank test, the hazards between the two groups are usually assumed to be proportional. Nevertheless, this hypothesis is no longer valid with unobserved covariates. As a consequence, there is a loss of power of the logrank test for testing the null hypothesis